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I thought the liquid helium is only for an engine testbed. Production Skylon engines will use liquid hydrogen and oxygen, effectively using their criogenic fuel
by iwwr 12y ago
I thought the liquid helium is only for an engine testbed. Production Skylon engines will use liquid hydrogen and oxygen, effectively using their criogenic fuel as a heat sink.
- hwillis 12y agoNo, they use helium still, due to hydrogen embrittlement of the exchanger, but the helium goes to another exchanger with the hydrogen.